Phenotype evaluation on downy mildew resistance of spinach germplasm resources

• Main Authors: DAI Yurou, MA Chenghao, PENG Feng, CAI Xiaofeng
• Format: Article
• Language: English
• Published: Academic Journals Center of Shanghai Normal University 2021-04-01
• Series: Journal of Shanghai Normal University (Natural Sciences)
• Subjects: spinach; downy mildew; germplasm resource; bolting
• Online Access: http://qktg.shnu.edu.cn/zrb/shsfqkszrb/ch/reader/view_abstract.aspx?file_no=20210217

Downy mildew is the main disease in the production of spinach.The selection and evaluation of germplasm resources is the implantation and basis of the breeding of spinach against downy mildew.In this study,the spinachtraits from different germplasm resources,such as botanical characteristics,reproduction cycle and disease resistance,which have downy mildew resistance,were identifiedby field observation.The results showed that the diversity index of 10 qualitative traits of 59 spinach germplasm resources was distributed between 0.25 and 1.23,and the coefficient of variation of 8 quantitative traits was between 24.25% and 42.80%,with an average of 29.54%.The identification of the resistance to downy mildew show that the spinach materials S1 to S36 are high-resistant materials,S37-S41 are disease-resistant materials,and S42-S59 are medium-resistant materials.The results of the bolting period survey showed that 81.4% of the materials belonged to early or middle bolting materials,18.6% of the spinach materials belonged to the late bolting materials.In conclusion,the spinach material S1 has an erect plant type,oval leaves,late bolting and high resistance to downy mildew,and there was no downy mildew disease in the test period,and the downy mildew disease index and incidence rate were both 0. It was excellent germplasm resource for resisting to spinach downy mildew and for late bolting breeding.